A093451 - cp's OEIS frontend

A093451 Number of distinct prime divisors of Product_{k=1+(n-1)n/2..n(n+1)/2} k (i.e., of 1, 23, 456, 78910, ...).

n	a(n)
1	0
2	2
3	3
4	4
5	6
6	6
7	7
8	8
9	10
10	10
11	11
12	13
13	13
14	14
15	16
16	15
17	18
18	17
19	20
20	19
21	22
22	21
23	22
24	24
25	24
26	26
27	26
28	27
29	30
30	28
31	30
32	31
33	32
34	33
35	33
36	36
37	35
38	36
39	38
40	39
41	39
42	39
43	43
44	41
45	43
46	44
47	44
48	47
49	45
50	49
51	48
52	48
53	52
54	49
55	53
56	53
57	54
58	54
59	55
60	58
61	55
62	60
63	59
64	59
65	62
66	60
67	65
68	64
69	64
70	65
71	66
72	68

[0, 2, 3, 4, 6, 6, 7, 8, 10, 10, 11, 13, 13, 14, 16, 15, 18, 17, 20, 19, 22, 21, 22, 24, 24, 26, 26, 27, 30, 28, 30, 31, 32, 33, 33, 36, 35, 36, 38, 39, 39, 39, 43, 41, 43, 44, 44, 47, 45, 49, 48, 48, 52, 49, 53, 53, 54, 54, 55, 58, 55, 60, 59, 59, 62, 60, 65, 64, 64, 65, 66, 68]

cp's OEIS Frontend

A093451 Number of distinct prime divisors of Product_{k=1+(n-1)n/2..n(n+1)/2} k (i.e., of 1, 23, 456, 78910, ...).

Table of values

List of values

n	a(n)
1	0
2	2
3	3
4	4
5	6
6	6
7	7
8	8
9	10
10	10
11	11
12	13
13	13
14	14
15	16
16	15
17	18
18	17
19	20
20	19
21	22
22	21
23	22
24	24
25	24
26	26
27	26
28	27
29	30
30	28
31	30
32	31
33	32
34	33
35	33
36	36
37	35
38	36
39	38
40	39
41	39
42	39
43	43
44	41
45	43
46	44
47	44
48	47
49	45
50	49
51	48
52	48
53	52
54	49
55	53
56	53
57	54
58	54
59	55
60	58
61	55
62	60
63	59
64	59
65	62
66	60
67	65
68	64
69	64
70	65
71	66
72	68

n	a(n)
1	0
2	2
3	3
4	4
5	6
6	6
7	7
8	8
9	10
10	10
11	11
12	13
13	13
14	14
15	16
16	15
17	18
18	17
19	20
20	19
21	22
22	21
23	22
24	24
25	24
26	26
27	26
28	27
29	30
30	28
31	30
32	31
33	32
34	33
35	33
36	36
37	35
38	36
39	38
40	39
41	39
42	39
43	43
44	41
45	43
46	44
47	44
48	47
49	45
50	49
51	48
52	48
53	52
54	49
55	53
56	53
57	54
58	54
59	55
60	58
61	55
62	60
63	59
64	59
65	62
66	60
67	65
68	64
69	64
70	65
71	66
72	68

cp's OEIS Frontend

A093451 Number of distinct prime divisors of Product_{k=1+(n-1)n/2..n(n+1)/2} k (i.e., of 1, 2*3, 4*5*6, 7*8*9*10, ...).

Table of values

List of values

A093451 Number of distinct prime divisors of Product_{k=1+(n-1)n/2..n(n+1)/2} k (i.e., of 1, 23, 456, 78910, ...).

n	a(n)
1	0
2	2
3	3
4	4
5	6
6	6
7	7
8	8
9	10
10	10
11	11
12	13
13	13
14	14
15	16
16	15
17	18
18	17
19	20
20	19
21	22
22	21
23	22
24	24
25	24
26	26
27	26
28	27
29	30
30	28
31	30
32	31
33	32
34	33
35	33
36	36
37	35
38	36
39	38
40	39
41	39
42	39
43	43
44	41
45	43
46	44
47	44
48	47
49	45
50	49
51	48
52	48
53	52
54	49
55	53
56	53
57	54
58	54
59	55
60	58
61	55
62	60
63	59
64	59
65	62
66	60
67	65
68	64
69	64
70	65
71	66
72	68